Join Date: Sep 2011
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Yes you can get lockup in 2nd.
Using a lockup switch does two great things. First, it puts a amazing amount more power to the wheels. The converter robs a lot of go!
The second benefit is to stop the truck from unlocking the converter every time you let off the throttle and relocking when you use any throttle again.
On a stock trans that may not be a big deal but if you have a built trans with high line pressure and a triple disc converter, it is. The converter slams in pretty hard.
If you have the button on, it’s gonna shift locked. It’s not as violent as you’d think, the converter hitting lockup is a harder hit.
I rarely do that, it’s gotta be really hard on the trans parts and I wouldn’t recommend you run around shifting locked either.
The trans doesn’t lock in 1st. If you hit the button while in Drive at a stop, nothing happens. When you take off, it will go through 1st like normal, then lock as it hits 2nd, and stay locked as it hits 3rd and 4th.
Unless you have your foot on the floor, it will shift way early.
If you take the gearshift out of “Drive” and manually select 2nd, the lockup switch won’t work.
There’s a valvebody modification that will allow it to lock manually in 2nd.
Ask Firepunk if they already did it for you.
When the lock button is on, the trans doesn’t want to downshift.
If you’re in 4th and hit your “OD Off” button on the end of the gearshift, it won’t work. You have to turn the lockup switch off to get it to drop down to 3rd.
It’s pretty hard to drive the truck and unlock before every shift, since you don’t have control of exactly when the auto shifts.
The other main use for the switch is using an exhaust brake. The (annoying as hell) way the Dodge unlocks the converter whenever you let off the throttle makes an exhaust brake worthless, you need to be able to keep it locked. That’s my most frequent use of “the button”.
About your cut wire... well, it’s already cut, short of replacing the wiring harness I guess you just solder and heat shrink it back together.
When you turn off your manual lock button, the trans works exactly like stock.
I believe the best thing is to use a headlight-dimmer-style floor button, on the left side. I screwed mine to a heavy rubber big-truck mudflap that I cut to fit my floor. It just sits under my regular floormat and I didn’t have to put holes in my floor, and I could slide it around and find the best spot for the button. It never moves and is nice and solid. Operating lockup with your left foot is totally natural like using a clutch pedal.
All this is why people swap in Allison transmissions. That’s what I wish I had done.
Drive a Chevy that has one and you’ll see what I mean, they just put all the power to the wheels, automatically. Without all this messing around.
'99 QC 4x4 Dually.
In the near future Iím ripping out all the electronic junk and P-pumping it.
Built trans, Gear Vendors overdrive, Kelderman Air Ride